Mail going to spam folder, using codeigniter, server is godaddy, its not duplicate

Question

Here is my code, i have tried for 12 hours but did not found solution. my email going to spam folder, it should go to inbox. can you correct it ?

problem can be in smtp details, this code was working fine on development server but when we shifted to client server and updated smtp then its showing problem of mail going to spam folder.

public function step4()
{
       parse_str(substr(strrchr($_SERVER['REQUEST_URI'], "?"), 1), $_GET);
       $data['trip'] = $this->input->xss_clean($_GET['trip']);
       $data['travel_date'] = $this->input->xss_clean($_GET['travel_date']);
       $data['origin_id'] = $this->input->xss_clean($_GET['origin_id']);
       $data['destination_id'] = $this->input->xss_clean($_GET['destination_id']);
       $data['origin'] = $this->input->xss_clean($_GET['origin']);
       $data['destination'] = $this->input->xss_clean($_GET['destination']);
       $fees = count(explode(',',substr($this->input->xss_clean($_GET['checkbox']),0,-1)));
       $data['price'] = $this->input->xss_clean($_GET['price']);
       $data['bus_id'] = $this->input->xss_clean($_GET['bus_id']);
       $data['timing'] = $this->input->xss_clean($_GET['timing']);
       $data['duration'] = $this->input->xss_clean($_GET['duration']);
       $data['kilometers'] = $this->input->xss_clean($_GET['kilometers']);
       $data['stops'] = $this->input->xss_clean($_GET['stops']);
       $data['route_id'] = $this->input->xss_clean($_GET['route_id']);
       $data['time_id'] = $this->input->xss_clean($_GET['time_id']);

       $data['checkbox'] = $this->input->xss_clean($_GET['checkbox']);
       // print_r(explode(',',substr($data['checkbox'],0,-1)));

       $data['name'] = $this->input->xss_clean($_GET['name']);
       $data['contact'] = $this->input->xss_clean($_GET['contact']);
       $data['email'] = $this->input->xss_clean($_GET['email']);
       $data['pickup_place'] = $this->input->xss_clean($_GET['pickup_place']);
       $data['session_id'] = $this->session->userdata('session_id');
       $data['ref_code'] = $this->input->xss_clean($_GET['ref_code']);
       if($this->input->xss_clean($_GET['trip'])=="Round Trip"){
            $data['return_date'] = $this->input->xss_clean($_GET['return_date']);
            $data['return_origin_id'] = $this->input->xss_clean($_GET['destination']);
            $data['return_destination_id'] = $this->input->xss_clean($_GET['origin']);
            $fee_return = count(explode(',',substr($this->input->xss_clean($_GET['checkbox_return']),0,-1)));
            $data['return_price'] = $this->input->xss_clean($_GET['return_price']);
            $data['return_bus_id'] = $this->input->xss_clean($_GET['return_bus_id']);
            $data['return_timing'] = $this->input->xss_clean($_GET['return_timing']);
            $data['return_duration'] = $this->input->xss_clean($_GET['return_duration']);
            $data['return_kilometers'] = $this->input->xss_clean($_GET['return_kilometers']);
            $data['return_stops'] = $this->input->xss_clean($_GET['return_stops']);
            $data['return_route_id'] = $this->input->xss_clean($_GET['return_route_id']);
            $data['return_time_id'] = $this->input->xss_clean($_GET['return_time_id']);

            $data['checkbox_return'] = $this->input->xss_clean($_GET['checkbox_return']);
            $data['total_price'] = $this->input->xss_clean($_GET['total_price']);
        }
        if($this->input->xss_clean($_GET['trip'])=="Round Trip"){
            $data['fee'] = count(explode(',',substr($data['checkbox'],0,-1))+explode(',',substr($data['checkbox_return'],0,-1)))*1;
        } else { 
            $data['fee'] =  count(explode(',',substr($data['checkbox'],0,-1)))*1;
        }

        $name=$this->input->xss_clean($_GET['name']);
        $email=$this->input->xss_clean($_GET['email']);  
        $pickup_place=$this->input->xss_clean($_GET['pickup_place']);  
        $contact=$this->input->xss_clean($_GET['contact']);
        $pickup_id=$data['pickup_place'][1];
        $data['step_four'] = $this->select_seat_model->insert_select_seat($name, $email,  $pickup_place,  $contact,  $data);
        $data['reservation'] = $this->select_seat_model->getReservation($route_id);
        $data['pickup'] = $this->select_seat_model->getPickupName($pickup_id);
        //$this->session->set_userdata($array);     

        $config['protocol'] = 'smtp';
        $config['smtp_host'] = 'localhost';
        $config['smtp_port'] = 25;
        $config['smtp_user'] = 'new_psdxpress@psdxpress.com';
        $config['smtp_pass'] = 'X52udnHGgD6P';
        $config['mailtype'] = 'html';
        $config['charset'] = 'iso-8859-1';
        $config['wordwrap'] = TRUE;
        // Load email library and passing configured values to email library 
        $this->load->library('email', $config);
        $this->email->set_newline("\r\n");
        // Sender email address
        $this->email->from('noreply@psdxpress.com', 'no reply');
        // Receiver email address
        $this->email->to('akramalibikaner@gmail.com',$this->input->post('email'));
        // Subject of email
        $this->email->subject('E-ticket');
        // Message in email
        $body = $this->load->view('e-ticket.php',$data,TRUE);
        $this->email->message($body);


        $ok = $this->email->send();


        if($ok=1) {
            $this->session->set_flashdata('msg','E-ticket sent on your mail'); 
            $this->load->view('step4.php');
        } else {
            $this->session->set_flashdata("msg","Error in sending Email."); 
            $this->load->view('dashboard');
        }

    }